next up previous contents
Next: 11.1.5 Temperature-Dependent Degradation Correction Up: 11.1.4 Time-Dependent Degradation Correction Previous: 11.1.4.4 Calibration Updates

11.1.4.5 Application of Degradation Correction

The degradation ratio at 1985.0, which corresponds to the mean time of the ITFs, was calculated for each wavelength bin using the linear fits. A zeropoint correction was then applied to the y-intercepts in order to force the degradation ratios to be one. This ensures that no degradation correction will be applied to data near the 1985.0 fiducial date.

The ratios are applied to the net flux spectra using a nearest neighbor wavelength interpolation scheme along with the inverse sensitivity function so as to provide absolutely calibrated and degradation-corrected flux data. Extended source images are corrected using the point source ratios. The correction is performed in the following manner:


next up previous contents
Next: 11.1.5 Temperature-Dependent Degradation Correction Up: 11.1.4 Time-Dependent Degradation Correction Previous: 11.1.4.4 Calibration Updates
Karen Levay
12/4/1997